Interesting, most Tor operators are doing so because they feel that people should have a right to anonymity or an uncensored internet connection. I'd even argue that Tor trades lives in a far more direct way than 8chan ever could given that fentanyl and weapon sales as well as plotting of child abductions or slave sales occur right there.
Tor operators in doing so are making a choice: they feel the freedom of anonymity and speech are more important than human lives, even the lives of children.
I'd argue that running a Tor node is explicitly making that choice and that statement, so then it confuses me why you seem to be okay with Tor but more questioning of 8chan and similar services where the choice is made less directly. Is it a matter of having the ability to discern "good" uses from "evil"? You're surely accepting both uses by operating a Tor node and knowingly doing so, so I don't see how that makes sense.
If you want to look at gun laws on the other hand, that's a freedom for security trade that seems more debatable given that other countries have the same access to information, but not nearly the same gun violence problems.